Patents for the Tamron 24-105mm f/4 and 18-55mm f/3.5-5.6 have been found, and you can read about them below:
Overview
- [Public number] P2022111228
- [Title of Invention] Zoom lens and imaging device
- [Application Date] 2022-06-07
- [Applicant]
[Identification number] 000133227
[Name] Tamron Co. , Ltd. - Kind Code: A1 An object of the present invention is to provide a standard zoom lens with high optical performance while reducing the weight of a focus group, and an imaging apparatus equipped with the zoom lens.
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2. Description of the Related Art
Imaging devices using solid-state imaging devices such as digital still cameras, digital video cameras, single-lens reflex cameras, and single-lens mirrorless cameras have been widely used. An imaging lens called a standard zoom lens is widely used in these imaging apparatuses. A standard zoom lens generally refers to a zoom lens whose zoom range includes a focal length of 50 mm in terms of 35 mm format. - [0005]
However, in the zoom lens disclosed in Patent Document 1, the second lens group responsible for the main zooming action is used as the focus group. The second lens group has a large number of lenses and is heavy compared to other lens groups. Therefore, it is difficult to perform quick autofocus. In addition, since the second lens group is heavy, the driving mechanism for moving the second lens group during focusing also becomes large. Therefore, there is a problem that the entire lens unit including the lens barrel is increased in size and weight. - SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a standard zoom lens with high optical performance while reducing the weight of the focus group, and an imaging apparatus equipped with the zoom lens.
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Example 1
- Focal length: 24.695-101.989
- F-value: 4.119
- Half angle of view: 42.156-11.409
- Image height: 21.633
- Total length: 170.000-207.607
- Back focus: 39.019
Example 2
- Focal length: 18.538-53.339
- F-value: 3.605-5.7607
- Half angle of view: 38.587-14.755
- Image height: 14.200
- Overall length: 133.849-120.000
- Back focus: 38.002
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